Pump for lubricating systems.



E. WOERNER.

PUMP POR LUBRIGATING SYSTEMS.

APPLICATION FILED 00T. 3, 1911.

Patented Nov. 18, *1913;

end of the UNITED STATES PATENT oEEIoE.j

EUGEN WOERNER, 0F CANNSTATT, GERMANY, ASSIGNOR TO THE FIRM 0F ROBERT BOSCH, OF STUTTGART, GERMANY.

To all whom it may concern j Be it known that I, EUGEN `WOERNER, a subject of the Emperor of Germany, and residing at Cannstatt, Germany, have invented certain new and useful Improvements in Pumps for Lubricating Systems; andI do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to pumpsA for lubricating systems adapted to force the lubricant through conduits to the parts to be lubricated, and particularly to a pump having a plurality of pistons which, in addition to the reciprocating movements for their suction and forcing functions, are giv`en oscillating movements to regulate the ldistribution of the lubricant to the pump.

This application is a division of my copending application Serial No. 581,479, filed September 12, 1910, wherein as in this case also, a plurality of pump cylinders are mounted in a circle about a common driving shaft and wherein the reciprocating movements are attained by providing the heads of the pistons with crank slides which engage the rim of an inclined disk fastened on the driving shaft. In my former application, rotary movements in a single direction are imparted to the pump pistons .by appro-4 priate projections on the outer periphery of the inclined disk and co-act-ing cogge'd surfaces carried bythe pump piston.y l the present application oscillating Inovelnents in both directions of'rotation are imparted to the pump pistons by an eccentric arrangement.. j

In the accompanying drawings illustrating the present invention, Figure 1 is a central vertical section on linel--l of 2; and 2 is a horizontal section on line 2-2 of Fig. 1.

An inclined disk c is clamped 'fast upon the driving shaft A and the eccentric rim fh. thereof projects between the laterally extending yokes 7L which are carried on the upper pump pistons b. There may be any number 0f individual pumps, eight of them being shown in the drawings. The cylinders a' are arranged in a circle about the driving shaft A and each cylinder has an oil passage f. `Each piston b has an oil duct g periphery of the ring r are Specication of Letters Patent. Patented NOV. 18, 1913.

Original application led September 12, 1910, Serial N o. 581,479. Divided a 3, 1911. Serial No.` 652,519.

on' the lower end, adapted to be brought into and out of register with the oil passage f, as a result of the oscillating movements. Below each piston is acheck-valve o in the nipple t to which a lubricatingv conduit is attached. The inclined disk c has an eccentric rim n projecting within the laterally extendingyokes /z and over the central axes of the pistons. All of the yokes are enveloped by a ring 7- resting loosely upon the lugs o which may be cast upon the interior surface wall of the oil receptacle O.

The operation of the device is as follows: The inner diameter of the ring 1 is so chosen thatthe yokes z. fit between the ring and the periphery of the disk in such manner that the et Jes a' of the yokes Il at the periphery of the disk and the edges y at the inner in loose Contact with the ring and the disk when the crank slides are correspondingly oblique.. The pump shown at the eXtreme left in Fig. 2 has just completed its discharge stroke, the lowest point of the under face of the rim n then contacting with the crank. slide L of that pump. The Contact screw m is so adjusted that a small amount of play exists between its lower end and the upper face of rim n, so thatas the shaft A continues to rotate, the piston is not moved until the rim n has advanced about 10 to 20 degrees in the direction of the'arrow, whereupon the rim n then contacts with the screw m. During this part of the rotation, communication between the ports g and f is established, and not until y thishas taken place does the suc-.tion stroke of the piston commence, Thel rim n` is substantially plane, andthereforethe speedloi travel of thepiston is'slow at first, and increasesV as tlie pointrenioved ,90? from the piston' approaches. Simultaneously the area of communication'between the 'ports g and V nd this applicationrled October increases and 'they vmagisterV completely when i the disk has rotated about o and the piston has attained its maximum speed. At the end of the suction stroke, the communication between the ports is almost closed and the speed of the piston is considerably decreased. Thus one effect of the arrangement disclosed herein is to automatically correlate the speed of the piston and the area of communication between the ports. During the entire suction stroke, the oil is sucked from the supply O through the ports f and g to the chamber below the piston, the valve u then being closed to the exterior. When the disk c has rotated about 180 from the position shown in Fig. 2, port g again comes into the position shown in that figure, and immediately thereafter the play of rim n between the contactscrew m and the crank slide It is used up, and the lower side of the rim n contacts with the lower surface ofthe crank slide, thus causing the downward discharge circuit of the pump to begin. During this stroke the port g has moved still further from the port f. The saine action tak-es place in each of the other pumps.

It will now be understood from the foregoing description of the method of operation that during one-half of the rotation of the shaft A, that is, during the suction stroke of the piston b of the pump, the oil duct g' thereof is turned from an initial closed position out of register with the passage f of the cylinder to a position of complete register therewith, and thence in the opposite direction of oscillation to the initial closed position, as will be understood by referring to the pumps in Fig. 2 on the extreme right, at the bottom and on the extreme le t; while during the succeeding half rotation of the shaft A the oil duct g is turned away from the initial closed position to a position more remote from its position of register and then returned in the opposite direction of oscillation to the initial closed position, as will be understood by referring to the pumps in Fig. 2 on the eX- trehmer left, at the top and at the extreme rig t.

The stroke of the pump pistons may be individually adjusted by means of the screws m 'Wherebythe amount of oil dis` charged to any one of the lubricating conduits may be individually adjusted at will. Having thus described my invention, what I claim is:

1. A force pump for lubricating systems having a cylinder provided with an oil passage therein, a piston containing an oil duct, and mechanism for reciprocating the piston within the cylinder and for imparting to the piston an oscillating movement in such manner tliatstarting from an initial closed position the oil duct is brought into and out of register with the oil passage during one stroke of the 'piston and then is further removed from the registerinor position and returned to the initial closed position during the return stroke of the pump.

2. Force pump mechanism for lubricating systems comprising a plurality of cylinders having oil passages therein and arranged about a common center, pistons in said cylinders and containing oil ducts, yokes at the upper ends of said pistons, an inclined disk mounted for rotating eccentrically with respect to said common center and spanned by said yokes, the rotation of the inclined disk imparting to the pistons a reciprocating movement and a rotating movement, and means coperative with said yokes for imparting a return rotation to the pistons.

3. Force-pump mechanism for lubricating I systems comprising a plurality of cylinders having oil passages therein and arranged about a common center, pistons within said cylinders` and containing oil ducts, yokes at the upper ends of said pistons, an inclined disk mounted for rotation eccentrically with respect to said common center and spanned by said yokes, and means for swinging said yokes to impart oscillating movements t0 said pistons to bring the oil ducts into register with the oil passages when the pistons are moving in one direction and out of register with said passages when the pistons are moving in the opposite direction.

4. Force-pump mechanism for lubricating i systems comprising a plurality of cylinders having oil passages therein and arranged about a common center, pistons within said cylinders and containing oil ducts, yokes at the upper ends of said pistons, an incline disk mounted for rotating eccentrically with respect to said common. center and spanned by said yokes, and a ring r loosely enveloping said yokes, whereby rotation of the inclined disk imparts oscillating movement to said pistons tobring the oil ducts into register with the oil passages when the pistons are moving in one direction and out of register with said passages when the pistons are moving in the opposite direction.

In testimony whereof I aiiix my signature, in presence of two witnesses.

EUGEN WOERNER.

1Witnesses:

REIN HOLD ELwER'r, WALTHER STEINCKE. 

